LC1-D AC Contactor – 25A 3-Pole 1NO

YQNT LC1-D AC Contactor is a 25A-class three-pole AC magnetic contactor designed for AC motor control, remote switching, and motor starter applications.

The contactor uses three main power poles and a normally open auxiliary contact for control or signaling circuits. It can be used as part of motor control assemblies with suitable thermal overload relays, auxiliary contacts and other control accessories.

For correct selection, check the motor current, main circuit voltage, utilization category, coil voltage, contact configuration, and operating conditions before ordering.

Key Specifications

3-Pole Main Contacts and 1NO Auxiliary Contact

The LC1-D 25A contactor is a three-pole AC contactor.

The three main poles are used to switch the three-phase power circuit. The auxiliary contact is used for control, signaling or interlocking functions and should not be treated as a fourth main power pole.

Typical terminal identification is:

This 3P + 1NO configuration is suitable for three-phase AC motor control and common motor starter control circuits.

If an application requires four independently switched main circuits, a four-pole contactor should be selected instead.

25A AC-3 Contactor for Motor Control

The LC1-D 25A class is intended for AC motor control under the applicable AC-3 operating conditions.

The related 25A contactor data provides the following reference values:

• AC-3 rated current: 25A at 380V

• Conventional thermal current: 40A

• Rated insulation voltage: 660V

• Motor power reference: 11kW at 380/400V AC-3

Motor power must not be selected from the ampere rating alone.

Before selecting the contactor, compare the contactor rating with the motor nameplate current, operating voltage, utilization category, and starting duty.

For applications involving frequent inching, plugging, reversing or other demanding switching conditions, the applicable utilization category should be checked before ordering.

AC Contactor Coil Voltage Selection

The contactor coil is part of the control circuit and should be selected according to the available control power supply.

The coil voltage is different from the main circuit voltage.

For example, a three-phase motor may operate from a higher power-circuit voltage while the contactor coil operates from a separate control voltage.

Available coil configurations should therefore be confirmed according to the exact product ordering code.

When requesting a quotation, specify:

• Coil voltage

• Coil frequency

• Main circuit voltage

• Motor rated current

• Motor rated power

• Required quantity

The product unit may carry a coil identification code. The exact coil voltage and frequency should be confirmed from the approved product configuration before shipment.

AC-3, AC-1 and AC-4: Why the Rating Matters

Contactor current ratings cannot be compared without considering the utilization category.

AC-1 is generally associated with non-inductive or lightly inductive loads, while AC-3 is used for typical squirrel-cage motor starting and switching applications.

AC-4 represents more demanding motor duties such as inching, plugging and frequent reversing.

Therefore, a contactor described as 25A should not automatically be treated as a 25A contactor for every load condition.

For motor applications, confirm:

1. Motor rated current

2. Motor operating voltage

3. Motor power

4. Utilization category

5. Starting and stopping frequency

6. Required electrical and mechanical endurance

This information allows the contactor to be selected according to the actual operating duty rather than the model number alone.

Typical Applications

The LC1-D AC contactor is designed for applications involving remote switching and control of AC motor circuits.

Typical applications include:

• Three-phase AC motor starting and stopping

• Motor control panels

• Electromagnetic motor starters

• Motor control cabinets

• Star-delta starter assemblies

• Reversing and interlocking control

• AC equipment control circuits

• Motor starter assemblies with thermal overload protection

The contactor can be combined with suitable auxiliary contacts, thermal overload relays, mechanical interlocks and other control accessories to build a complete motor control system.

Accessory compatibility should be confirmed according to the selected contactor configuration.

Contactor and Thermal Overload Relay

A contactor controls the switching of the motor circuit. A thermal overload relay provides overload protection for the motor.

For a conventional motor starter assembly, the contactor and overload relay should be selected as a matched combination.

The selection should consider:

• Motor full-load current

• Contactor AC-3 rating

• Overload relay adjustment range

• Main circuit voltage

• Coil voltage

• Installation method

• Required auxiliary contacts

YQNT can review the motor and control-circuit requirements to help identify the appropriate contactor and related protection components.

Why Choose YQNT LC1-D AC Contactors

YQNT provides AC contactors for B2B electrical equipment buyers, distributors, panel builders and OEM customers.

For LC1-D contactor requirements, YQNT supports:

• Product specification matching

• Coil voltage and contact configuration confirmation

• Technical documentation

• OEM and private-label requirements

• Product inspection requirements

• Export packaging and documentation

• Project-based product selection

For quotation, provide the required current, voltage, coil specification, contact configuration and quantity so the product configuration can be checked before order confirmation.

 What is an LC1-D AC Contactor?

An LC1-D AC Contactor is an electromagnetic contactor used to switch and control AC electrical circuits, particularly AC motor circuits.

What is the rated current of the 25A LC1-D contactor?

The 25A class is associated with a 25A AC-3 current reference under the applicable 380V conditions.

Is the LC1-D 25A contactor a 3-pole or 4-pole contactor?

The standard configuration described on this page is a three-pole contactor with three main normally open power contacts.

Is the auxiliary contact a fourth main pole?

No. The auxiliary contact is a control or signaling contact. It is not equivalent to a fourth main power pole.

What is the auxiliary contact configuration?

The configuration described for this product is 1NO auxiliary contact.

What motor power can a 25A AC contactor control?

The related 25A contactor data lists 11kW at 380/400V under AC-3 conditions. Final selection should be based on the motor rated current, voltage and actual operating duty.

Does the contactor coil voltage equal the motor voltage?

Not necessarily. The coil voltage belongs to the control circuit, while the motor voltage belongs to the main power circuit. They should be specified separately.